fix(ci): add explicit shell: bash declarations to provenance workflow

Add explicit shell: bash declarations to three run steps in
provenance.yml that use bash-specific syntax (arrays, set -euo pipefail).
This ensures consistent behavior across different CI runners.

Author: jdalton

.github/workflows/provenance.yml

@@ -198,6 +198,7 @@ jobs:
 
       - name: Publish binary packages
         if: ${{ inputs.socket && !inputs.dry-run }}
+        shell: bash
         env:
           VERSION: ${{ steps.version.outputs.cli_version }}
           TAG: ${{ steps.version.outputs.cli_tag }}
@@ -298,6 +299,7 @@ jobs:
       # Copy iocraft binaries to package directories.
       - name: Copy iocraft binaries to packages
         if: ${{ inputs.iocraft }}
+        shell: bash
         run: |
           set -euo pipefail
 
@@ -333,6 +335,7 @@ jobs:
 
       - name: Publish @socketaddon/iocraft platform packages
         if: ${{ inputs.iocraft && !inputs.dry-run }}
+        shell: bash
         env:
           VERSION: ${{ steps.version.outputs.iocraft_version }}
           TAG: ${{ steps.version.outputs.iocraft_tag }}